Journal of Volcanology and Geothermal Research最新文献

{"title":"Investigating the connection between superhydrous melts, magma reservoir nucleation and the scarcity of mafic eruptions in post-collisional settings","authors":"Alissa Näpflin ,&nbsp;Răzvan-Gabriel Popa ,&nbsp;Ioan Seghedi ,&nbsp;Olivier Bachmann","doi":"10.1016/j.jvolgeores.2026.108542","DOIUrl":"10.1016/j.jvolgeores.2026.108542","url":null,"abstract":"<div><div>Magma reservoir emplacement in the brittle upper-crust typically requires prolonged heating to modify host-rock rheology, allowing magma to accumulate rather than erupt. In thermally immature crust, early eruptions are expected to be mafic, yet many volcanic provinces, particularly those with water-rich melts, lack significant initial mafic volcanism, suggesting an alternative trapping mechanism. We investigate this using Caraci volcano (Romania's Apuseni Mountains), a water-rich system that started with relatively differentiated, andesitic eruptions. The first eruptions at Caraci extruded water-rich (5–6 ± 0.35 wt% dissolved H₂O) amphibole-plagioclase andesites (890–920 ± 22 °C) stored at water-saturated conditions in the upper-crust (∼2 ± 0.5 kbar). These magmas were associated with superhydrous primitive melts (&gt;6 wt% H₂O), which evolved in a polybaric system (crystallization pressure varying from 2 to 8 ± 0.5 kbar), evidenced by high-Mg amphibole and delayed plagioclase crystallization. These deeper storage melts likely reached water saturation during ascent towards the upper crust, inducing degassing and crystallization, which increased viscosity and enabled stalling in the cold crust, explaining the lack of initial mafic eruptions and providing the efficient trapping mechanism in a thermally immature crust. Progressive drying of the source and generation of less hydrous magmas initiated the eruptions and construction of the stratovolcano, and ultimately terminated the system. As a result, the final eruption extruded somewhat drier (4–4.5 ± 0.35 wt% H₂O), hotter (930–960 ± 45 °C) pyroxene-bearing andesites erupted from water-undersaturated storage. This trapping mechanism of water-rich magmas may explain the typical scarcity of mafic volcanism in arc and post-collisional settings.</div></div>","PeriodicalId":54753,"journal":{"name":"Journal of Volcanology and Geothermal Research","volume":"472 ","pages":"Article 108542"},"PeriodicalIF":2.3,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146081931","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Volcanism and tectonic style dominate geothermal activity in the Tengchong block","authors":"Haijin Xu ,&nbsp;Qiang Liu ,&nbsp;Fan Feng ,&nbsp;Shaoji Yang ,&nbsp;Hanhui Li ,&nbsp;Qinghai Guo","doi":"10.1016/j.jvolgeores.2026.108554","DOIUrl":"10.1016/j.jvolgeores.2026.108554","url":null,"abstract":"<div><div>Volcanism and tectonic processes play a decisive role in the formation of high-temperature geothermal systems in the Tengchong region. This study integrates field mapping, structural analysis, mineralogy and whole-rock geochemistry of the volcanic rocks in the Xinhua-Puchuan area (Tengchong block) to decipher the geothermal activity. Two types of tectonics have been recognized: the ductile shear deformation and the brittle fracture. The shear zones are the near N-S trending right-lateral strike-slip shear zones that have transformed the host rocks into mylonitic rocks. The brittle fractures consist of the near N-S trending and near NWW-SEE trending faults. The near N-S trending faults were developed on the pre-exist ductile shear deformation zone, acting as the conducting heat channels for the geothermal field. The near NWW-SEE trending secondary faults are strike-slip normal faults that facilitate the release of heat and geothermal fluids to form the hot springs. The volcanic rocks, including Pleistocene basalt, andesite and dacite, were widely erupted along the near N-S trending faults. The basalts are the continental within-plate alkaline olivine-basalts formed in a continental rift or extensional tectonic setting. The mantle-derived magma underwent a fractional crystallization (FC) process. From olivine-basalt to dacite, the dominated dark mineral phenocrysts track progressive differentiation: olivine→clinopyroxene(Cpx)/ orthopyroxene(Opx) → hornblende ± biotite, with plagioclase evolving fromlabradorite (An 64) to andesine (An 37). Furthermore, the major and trace elements also change systematically with the SiO₂ contents from the basalt to dacite. The pyroxene phenocrysts in the dacites are diopside and enstatite. The two-pyroxene thermometer suggests that the pyroxene crystallization temperatures range from 1161 to 994 °C. Tschermakite hornblende in dacitic magma records crystallization conditions at 5.7–6.0 kbar and 849–902 °C, consistent with a residual magma chamber at mid-crustal depth. These results establish a genetic linkage between the regional tectonic framework and geothermal manifestation: ductile shear zones act as primary conduits transferring heat from the mid-crustal magma reservoir, while brittle fault networks enable efficient heat extraction and surface expression.</div></div>","PeriodicalId":54753,"journal":{"name":"Journal of Volcanology and Geothermal Research","volume":"472 ","pages":"Article 108554"},"PeriodicalIF":2.3,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146190866","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Seismic characteristics of the April 2024 eruption of Ruang Volcano, North Sulawesi, Indonesia","authors":"Sri Hidayati ,&nbsp;Hetty Triastuty ,&nbsp;Sulistiyani Sulistiyani ,&nbsp;Wendy A. McCausland ,&nbsp;Christina Widiwijayanti ,&nbsp;Martanto Martanto ,&nbsp;Sofyan Primulyana ,&nbsp;Heruningtyas Desi Purnamasari ,&nbsp;P. Hadi Wijaya","doi":"10.1016/j.jvolgeores.2026.108537","DOIUrl":"10.1016/j.jvolgeores.2026.108537","url":null,"abstract":"<div><div>The two most recent eruptions of Ruang volcano, in 2002 and 2024, have been large (VEI 4) with very short precursory periods, 3 and 6 days, respectively. Background seismicity at Ruang volcano is generally low with 0–2 volcano-tectonic (VT) earthquakes per day. The 2024 eruptions were preceded by a notable increase in VT earthquakes from 11 to 15 April with a rapid escalation from 16 to 17 April in the form of increased VT swarms, and the appearance of low frequency earthquakes and short bursts of VT drumbeats shortly before the eruption. Similar VT seismic unrest was recorded in March 2015, May 2016, and April 2022, although none of these episodes culminated in an eruption. A comparison of seismic energy release between April 2022 and April 2024 shows distinct differences. In 2024, cumulative seismic energy reached its peak within 5 days, just before the onset of eruption on 17 April. In contrast, during the 2022-episode, energy release followed a more gradual increase over 8 days peaking on 16 April, then declining gradually without leading to eruption. Notably, low frequency (LF) and drumbeat earthquakes were absent in non-eruptive unrest episodes. The transition to proximal LFs in 2024 likely signals pressure fluctuations, intensified magma degassing, and conduit formation, acting as an important precursor to eruption. Additionally, the occurrence of short bursts of drumbeat seismicity likely reflects the onset of the shallow magma ascent and was an important short-term precursor to the eruption. Finally, we examine the potential influence of regional tectonic earthquakes on the escalation of precursory unrest in 2024.</div></div>","PeriodicalId":54753,"journal":{"name":"Journal of Volcanology and Geothermal Research","volume":"472 ","pages":"Article 108537"},"PeriodicalIF":2.3,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146190871","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The nucleation and growth of mixed H2O–CO2 bubbles in magmas","authors":"Patrick Sullivan ,&nbsp;Edward W. Llewellin ,&nbsp;Fabian B. Wadsworth ,&nbsp;Simone Colucci ,&nbsp;Halim Kusumaatmaja","doi":"10.1016/j.jvolgeores.2026.108538","DOIUrl":"10.1016/j.jvolgeores.2026.108538","url":null,"abstract":"<div><div>Volcanic eruptions are driven by the nucleation and growth of gas bubbles that form when volatile species dissolved in magma become supersaturated. Previous models for bubble growth have focussed on H₂O; however, CO₂ also plays a fundamental role in the nucleation and growth of gas bubbles. Here, we develop a numerical model to explore the nucleation and growth of bubbles containing both H₂O and CO₂ in magma of arbitrary composition. Nucleation is modelled as a Poisson process using classical nucleation theory with composition-appropriate solubility models for the mixed H₂O–CO₂ fluid. We find that CO₂ dramatically increases the depth of bubble nucleation compared with H₂O-only systems; for a case-study rhyolite (Krafla, Iceland) CO₂ increases nucleation depth from 130 m (H₂O-only) to 760 m if CO₂ is included (a factor of 6 increase in nucleation pressure); for a case-study basalt (Fagradalsfjall, Iceland), nucleation occurs at 13 km depth if CO₂ is included, but does not occur at all if H₂O is the only volatile species. Post-nucleation growth of the bubbles is investigated by extending a ‘shell model’ to include CO₂ as well as H₂O. The species are coupled via a mixed equation-of-state for the gas phase, introducing a co-dependence on their solubility that allows H₂O to exsolve at greater depth when CO₂ is present. As a result, exsolution of a small volume of CO₂ can trigger the exsolution of a much larger volume of H₂O, driving rapid, disequilibrium bubble growth. Our findings show that accounting for mixed H₂O–CO₂ volatile compositions is essential for accurate modelling of magma ascent and eruption dynamics.</div></div>","PeriodicalId":54753,"journal":{"name":"Journal of Volcanology and Geothermal Research","volume":"472 ","pages":"Article 108538"},"PeriodicalIF":2.3,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146190863","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Magmatic and gravity-driven deformation dynamics at Popocatépetl inferred from InSAR and GPS data","authors":"Cristian A. García-Sandoval ,&nbsp;J. Alejandro González-Ortega ,&nbsp;Dulce M. Vargas-Bracamontes ,&nbsp;Sébastien Valade ,&nbsp;Francesco Massimetti","doi":"10.1016/j.jvolgeores.2026.108560","DOIUrl":"10.1016/j.jvolgeores.2026.108560","url":null,"abstract":"<div><div>Quantifying surface deformation provides critical insights into magmatic processes governing volcanic unrest, as well as into the development of slope instabilities on the flanks of a volcanic edifice. However, it remains particularly challenging in semi-open systems where conventional models often fail, and the geodetic satellite observations reflect the overlapping effects of diverse sources or their absence. In this work, we investigate the Popocatépetl volcano surface displacement field, a persistently active andesitic system known for the emplacement of lava domes and explosive behavior with minimal deformation states. We employed Synthetic Aperture Radar Interferometry (InSAR) and Global Navigation Satellite System (GNSS) measurements, integrated with multiparametric observations from 2019 to 2023. During this period, Popocatépetl exhibited variations in eruptive dynamics, including the destruction of lava domes in 2019 and a transition to a higher-intensity eruptive stage between July 2022 and May 2023, with a low-amplitude inflation phase in GPS baselines that correlated with increased seismicity, degassing and thermal anomalies preceding intense volcanic activity in May 2023. To investigate the deformation mechanisms, we processed interferometric pairs from Sentinel-1A and ALOS-2 satellites to generate surface displacement time series and applied Independent Component Analysis (ICA). We find that the surface displacement field reflects the superposition of multiple processes operating across varying spatiotemporal scales: NE-SW persistent surficial flank motion (<span><math><mo>≤</mo></math></span> 50 mm/yr), NE crater subsidence (−40 mm/yr), and a potential superficial westward sliding (<span><math><mo>≈</mo></math></span> 10 mm/yr), reflecting complex magmatic and gravitational dynamics.</div></div>","PeriodicalId":54753,"journal":{"name":"Journal of Volcanology and Geothermal Research","volume":"472 ","pages":"Article 108560"},"PeriodicalIF":2.3,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146190953","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Giant pumice deposit from the post-74 ka Youngest Toba Tuff (YTT) eruption: Insights into storage conditions and eruption dynamics of subaqueous eruption","authors":"Gabriela Nogo Retnaningtyas Bunga Naen ,&nbsp;Atsushi Toramaru ,&nbsp;Indranova Suhendro ,&nbsp;Geri Agroli ,&nbsp;Indyo Pratomo ,&nbsp;Estu Kriswati ,&nbsp;Haryo Edi Wibowo ,&nbsp;Noriyoshi Tsuchiya","doi":"10.1016/j.jvolgeores.2026.108558","DOIUrl":"10.1016/j.jvolgeores.2026.108558","url":null,"abstract":"<div><div>The giant pumice (GP) preserved within lake sediments of the Toba Caldera represents post-YTT (Youngest Toba Tuff) activity and occurs as large clasts (&gt;1 m). These pumices display jointed, hyaloclastite, and brecciated textures, and contain plagioclase, orthopyroxene, amphibole, and oxides. The GP shares geochemical and textural features with the YtD of the 74 ka YTT, including low matrix-glass SiO₂, moderate to high Ba and Sr, low Y, absence of quartz and sanidine, and plagioclase with hollow textures. However, GP also displays distinguishing characteristics, notably the absence of biotite, simpler textures in amphibole and orthopyroxene, and lower Na₂O + K₂O and higher FeO in the matrix glass. These data suggest that GP represents a remnant of YtD magma that underwent reheating, modifying its chemical and textural signatures. Thermobarometry based on amphibole indicates magma storage at 127–289 MPa (±21 MPa) and temperatures of 792–913 °C (±22 °C). Despite high bulk-vesicularity and matrix-vesicle number densities (10¹⁴–10¹⁵ m⁻³), GP formed through effusive, subaqueous eruptions following extensive degassing. Pheno-vesicularity data from the clast margin show minimal H₂O exsolution (∼0.05 wt%), yet the drop from 5.9 wt% H₂O to 4.3 wt% H₂O implies ∼1.6 wt% H₂O should have been exsolved and recorded in the pheno-vesicularity if no outgassing during magma ascent. Interconnected vesicles and ruptured bubbles indicate that permeable gas escape occurred through shear-induced and collapse-related fracturing. After fragmentation, the margins quenched rapidly upon contact with lake water, preserving their lower vesicularity. Then a rigid outer shell formed, restricting additional gas loss and allowing the interior to retain more volatiles, producing its higher vesicularity.</div></div>","PeriodicalId":54753,"journal":{"name":"Journal of Volcanology and Geothermal Research","volume":"472 ","pages":"Article 108558"},"PeriodicalIF":2.3,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146190949","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Bubbles in Youngest Toba Tuff melt inclusions reveal pre-eruptive magma vesicularity and perhaps why the eruption was so big","authors":"Tyler Cadena,&nbsp;Michael Manga,&nbsp;Stephen Self","doi":"10.1016/j.jvolgeores.2026.108556","DOIUrl":"10.1016/j.jvolgeores.2026.108556","url":null,"abstract":"<div><div>The 75 ka eruption of the Youngest Toba Tuff is one of few eruptions proposed to be initiated by volatile accumulation, a seldom identified eruption initiation mechanism in large silicic systems. We searched for evidence of pre-eruptive exsolved volatiles in the erupted products of the Youngest Toba Tuff by using x-ray microtomography to image six quartz crystals, which contain populous bubbly melt inclusions. Analysis of 84 melt inclusions show an average of 8.6 bubble vol.% and 2.2 bubbles (maximum 11 bubbles) per inclusion. We find that 70% of inclusions have a bubble vol.% greater than 3, the maximum vol.% that could be caused by post-entrapment bubble growth, implying that these bubbly inclusions sampled an at-depth exsolved vapor phase that was co-entrapped with the melt. These physical observations support previous chemical analyses that suggest the eruption of the Youngest Toba Tuff was initiated by volatile accumulation. Using our vesicularity measurements and models for compressibility of multiphase materials, the exsolved vapor phase can increase magma compressibility by an order of magnitude. These changes in magma compressibility can promote especially large eruptions such as that responsible for the Youngest Toba Tuff.</div></div>","PeriodicalId":54753,"journal":{"name":"Journal of Volcanology and Geothermal Research","volume":"472 ","pages":"Article 108556"},"PeriodicalIF":2.3,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146190865","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Hydrous upper mantle facilitated alkali basalt genesis in the Southeastern Carpathians, Romania","authors":"Levente Patkó ,&nbsp;Ákos Kővágó ,&nbsp;Thomas Pieter Lange ,&nbsp;Alexandru Szakács ,&nbsp;Monika Huraiová ,&nbsp;Márta Berkesi ,&nbsp;László Előd Aradi ,&nbsp;Szilveszter Gergely ,&nbsp;Ábel Szabó ,&nbsp;Károly Németh ,&nbsp;Csaba Szabó ,&nbsp;István János Kovács","doi":"10.1016/j.jvolgeores.2026.108540","DOIUrl":"10.1016/j.jvolgeores.2026.108540","url":null,"abstract":"<div><div>This study investigates the structural hydroxyl content in clinopyroxenes from five cumulate xenoliths hosted by alkali basaltic pyroclastic rocks collected from the Perşani Mountains Volcanic Field (southeastern Transylvania, Romania), revealing structural hydroxyl concentrations ranging from 261 to 436 ppm wt. From these measurements, the ‘water’ content of the equilibrium parental alkali basaltic melt was estimated at 1.2 to 2.5 wt%, consistent with global values for alkali basalts. The mantle source ‘water’ content was also determined and resulted to be a ‘water’-rich mantle volume, ranging from 400 to 840 ppm wt. under batch melting and 310 to 660 ppm wt. for fractional melting models. The hydrous signature appears to be linked to the influence of an earlier subduction event, sustained by continued fluid release from remnants of the sinking slab at asthenospheric depths. The findings highlight the crucial influence of ‘water’ in upwelling mantle material, especially in regions affected by slab rollback and detachment, as is the case in the study area of the East Carpathian bend zone, where ‘water’ governs the extent of partial melting and enhances melt generation.</div></div>","PeriodicalId":54753,"journal":{"name":"Journal of Volcanology and Geothermal Research","volume":"472 ","pages":"Article 108540"},"PeriodicalIF":2.3,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146057591","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The dynamic summer of 2024 at Mt. Etna documented by UAS: Morphological changes and their gravimetric effects","authors":"Emanuela De Beni ,&nbsp;Cristina Proietti ,&nbsp;Massimo Cantarero ,&nbsp;Filippo Greco ,&nbsp;Luca Timoteo Mirabella ,&nbsp;Alfio Messina ,&nbsp;Daniele Carbone ,&nbsp;Danilo Contrafatto ,&nbsp;Juraj Papčo ,&nbsp;Pavol Zahorec ,&nbsp;Peter Vajda","doi":"10.1016/j.jvolgeores.2026.108562","DOIUrl":"10.1016/j.jvolgeores.2026.108562","url":null,"abstract":"<div><div>During the summer of 2024, Mt. Etna was characterized by a sequence of six powerful paroxysmal events originating from the Voragine summit crater. This activity marked a significant departure from the preceding years, when paroxysms at the Southeast Crater prevailed. The high dynamicity of this period required continuous and precise monitoring, mapping, and quantification, which were achieved through frequent Unoccupied Aerial System surveys. Using the difference of digital elevation models, which compared the pre-eruptive surface of April 29, 2024, against the post-eruptive surface of September 12, we clearly demonstrated a pattern dominated by net accumulation over the Voragine, with the greatest vertical accretion reaching over 108 m. This substantial growth, attributable to repeated lava effusion and pyroclastic deposition, established Voragine as the new peak of Mt. Etna, reaching an elevation of 3403 m a.s.l. on August 14. We then analyzed the effect of topography changes on gravimetric terrain corrections, which is important for computing the complete Bouguer anomaly, and the impact of variations in the nearest topography on the prediction of vertical gravity gradients. Owing to this effect, differences up to 10 mGal in terrain corrections and up to 150 μGal/m in vertical gravity gradient were calculated. This interdisciplinary work provides a detailed quantification of the eruptive products from Mt. Etna's 2024 volcanic sequence and highlights the critical impact of the resulting morphological changes on high-precision gravimetric surveys, thus emphasizing the need for up-to-date digital terrain models.</div></div>","PeriodicalId":54753,"journal":{"name":"Journal of Volcanology and Geothermal Research","volume":"472 ","pages":"Article 108562"},"PeriodicalIF":2.3,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146190950","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The application of InSAR DEMs for volcanic hazard assessments at Mount Taranaki, New Zealand","authors":"Samuel McGowan,&nbsp;Jonathan Procter,&nbsp;Stuart Mead,&nbsp;Gabor Kereszturi","doi":"10.1016/j.jvolgeores.2026.108553","DOIUrl":"10.1016/j.jvolgeores.2026.108553","url":null,"abstract":"<div><div>Interferometric Synthetic Aperture Radar (InSAR) can be used to detect ground motion but also processed further to generate Digital Elevation Models (DEMS). Sentinel-1 images are acquired continuously, and data is made available free of access in near real time making it a valuable tool for Earth observation and volcanic hazard assessment. Mass flow simulations require up to date DEMs for the results to be integrated in volcanic hazard management and mitigation. This study investigates the applicability of InSAR generated terrains as information and data with respect to volcanic hazard analysis as well as the input data in simulating block- and-ash flows (BAFs) following the collapse of volcanic domes on Mount Taranaki, New Zealand, using the Titan2D simulation toolkit. Results show that the accuracy of Sentinel-1 InSAR generated DEMs are limited for volcanic hazard analysis in areas of dense vegetation and steep topography due to temporal decorrelation and geometrical distortions. Together, these conditions introduce major differences in inundation extent and thickness distribution of simulated flows yet can provide some indication of flow impact which may be of relevance for rapid decision making in response to rapidly changing volcanic landscapes.</div></div>","PeriodicalId":54753,"journal":{"name":"Journal of Volcanology and Geothermal Research","volume":"472 ","pages":"Article 108553"},"PeriodicalIF":2.3,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146190869","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}